螺栓项目控股股份有限公司美股招股说明书(2025-07-15版)

This prospectus supplement updates, amends and supplements the prospectus dated April 3, 2025 (the “Prospectus”), which forms a 2025, which is set forth below.This prospectus supplement is not complete without the Prospectus. This prospectus supplement should be read in conjunction withthe Prospectus, which is to be delivered with this prospectus supplement, and is qualified by reference thereto, except to the extent that INVESTING IN OUR SECURITIES INVOLVES CERTAIN RISKS. SEE “RISK FACTORS” BEGINNING ON PAGE 7 OF THE Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if the Prospectusor this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense. San Francisco, CA94114(Address of principal executive offices)(Zip Code) (415) 325-5912(Registrant’s telephone number, including area code)N/A(Former name or former address, if changed since last report)Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrantunder any of the following provisions: Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) Title of each classSymbol(s)on which registeredCommon stock, par value $0.0001 pershareBSLKThe Nasdaq Stock Market LLC Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933(Sec.230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (Sec.240.12b-2 of this chapter). Gail Zauder to the Board to serve as Class II and Class III directors, respectively, effective as of that date. Mr. Lucree will serve for aterm expiring at the Company’s annual meeting of stockholders to be held in 2026, and Ms. Zauder will serve for a term expiring at qualified or until their earlier death, resignation, disqualification or removal.In connection with Mr. Lucree’s and Ms. Zauder’s appointment to the Board, each became eligible to participate in, and receive cashand equity compensation pursuant to the terms and conditions of, the Company’s Non-Employee Director Compensation Program Director Compensation Program” and are incorporated by reference herein.Each of Mr. Lucree and Ms. Zauder is expected to enter into the Company’s standard form indemnification agreement in the form filedas Exhibit 10.28 to the Company’s Registration Statement on Form S-4/A (File No. 333-276849) filed with the Securities andExchange Commission on July 10, 2024.